Pawn Shop/Jewelry appraisal

I am newly divorced and am looking to sell my engagement and wedding ring set. I know how much my ex paid for it in 2017, but I don't know how much its worth now. I guess the first step is to see how much a pawn shop would pay for it and then either take the offer or try to sell for a little higher myself somewhere (knowing they'll try to make a little money on it).

Where is the most reputable pawn shop? I'm on peninsula but willing to make a trip of it. Or if someone knows a good jewelry appraiser/resale. The store he bought from doesn't do buy backs unless it's for upgrades which I'm obviously not doing.

Thanks!